Industrial Wastewater Management and Disposal

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Industrial Wastewater Management and Disposal WQPN 51, OCTOBER 2009 Industrial wastewater management and disposal Purpose Industrial sites catering for light, general and heavy industry underpin the economy of the state and provide substantial employment opportunities. Industrial waste management practices may pose a significant risk to sensitive water resources. Appropriate site location, provision of services, facilities design and best operational management practices are needed to minimise this risk. Examples of the impacts that may occur when industrial wastes are discharged include petroleum hydrocarbons, heavy metals, surfactants, toxins and/or salts, which may pollute receiving waters rendering them unsuitable as a water supply or pose a threat to aquatic life. Some industrial wastes are volatile or release toxic gases. In receiving waters, excessive nutrients can lead to algal blooms, oxygen deficits and increase colour and turbidity. Industrial wastes are also recorded as contaminating underground water; for example, there are several large contamination plumes within the Kwinana industrial area. The addition of industrial waste to sewers can increase the cost and risk to the community of treating sewage. Industrial pollutants such as oxygen scavengers may corrode pipes and equipment in the sewerage collection system and in treatment plants. Greases and suspended matter can cause pipe blockages and odours. For further information on the potential effects of various contaminants discharged to sewer, and the usual approaches that water utilities take in managing these impacts, refer to the National water quality management strategy paper 12 (Reference 1). These notes advise on environmental issues and make recommendations on best practice. Key supporting information is provided in appendices. This information includes the department’s role, intended use of the note, sensitive water resources description, water resource buffers, relevant statutes and administering agencies, information for assessing development proposals and may include case studies, checklists and diagrams. Scope This note applies to industries as defined in the Town Planning Regulations 1967 Appendix B, schedule 1 (as amended); including: - abattoirs Industrial wastewater management and disposal www.water.wa.gov.au Page 1 of 28 - aquaculture - animal by product plants - animal holding and sales yards - animal product processing - chemical manufacture and formulation - energy production industries - fertiliser production - food processing - hospitals and aged care homes - laboratories - metal production and finishing - mineral processing - petrochemical works - recycling works - vehicle and plant servicing - water and wastewater treatment works - wool, hide and textile processing. Industrial wastewater includes contaminated stormwater, cooling water, process waters and wash-down waters. This note does not apply to cottage industries or municipal wastewater treatment works or solid waste, but may offer some useful guidance on potential risks to water resources and good practice. The Metropolitan Water Supply, Sewerage and Drainage by-laws 1981 (as amended) define industrial waste as being the liquid, solid or gaseous refuse from any business, industry, warehouse or manufacturing premises other than domestic sewage, stormwater, or unpolluted water. The wastewaters from staff amenities or offices at industrial premises are specifically excluded. The terms ‘industrial waste’ and ‘trade waste’ are used interchangeably in waste disposal publications. This note builds on the information supplied in other water quality protection notes (WQPN), such as General and heavy industry near sensitive waters, Light industry near sensitive waters, Extractive industries near sensitive water resources and Stormwater management at industrial sites (Reference 6b). Advice and recommendations Planning approvals and processes The notes described in the preceding paragraph provide recommendations on location of industrial premises for planning approvals. There are limitations discussed concerning the location of industries (and hence their wastewater facilities) near sensitive water resources areas (Appendix A). Industrial wastewater management and disposal Page 2 of 28 Although waste management may seem to be an operational issue, the choice of location affects options for the disposal of treated liquid waste. The availability of adequate service infrastructure, such as emergency management, waste recycling and disposal services, sewerage services, reticulated water supply, electricity, gas, communications and transport access should be assessed when selecting a potential site. Industrial wastewaters are subject to acceptance criteria for discharge to sewer (set by local government, the Water Corporation or other water providers’ systems) and may require on-site treatment. New industrial projects should only be located on land designated for industrial use (via consultative planning schemes) by the Western Australian Planning Commission or Department of Planning, and be appropriately zoned by the local government authority/council. Location 1 Industrial sites should be chosen where the wastewater would cause the least environmental and social impact. Environmental investigations should be used to assess the surrounding land usage, local climate factors, site topography, identification of sensitive water resources, soil strata, surface and groundwater movement, and the site’s land-use history. Industrial wastewater facilities should not be located in areas with a near surface water table that are prone to waterlogging or may be flooded during a 100-year average recurrence interval (ARI) event. This includes land which is seasonally wet, requires artificial drainage or diversion of natural watercourses, or where construction will affect sensitive waters. 2 Sensitive water resources require a range of management techniques to ensure their adequate protection such as definition and community awareness, separation buffers from intensive land usage, effective containment of potentially mobile contaminants, regulation of land-use activities, appropriate waste management decisions by land-use operators, catchment surveillance/monitoring and remedial action to address historical contamination problems. 3 Legally established, but non-conforming, industrial wastewater sites can normally remain near sensitive water resources; however, operators should undertake regular environmental risk assessments and employ best environmental management practice to limit the risk of environmental harm. 4 New sites or expanded use of existing industrial wastewater sites should not occur unless the proponent can demonstrate that industry is unlikely to harm or pose significant risk to the environment during construction, operation or after closure of the premises. Risk mitigation measures may include: a selection of low vulnerability settings suited to the nature of the planned industrial activity b effective community consultation c fail-safe containment of any facilities that could put the environment at risk d adequate buffers to nearby sensitive land uses and water resources Industrial wastewater management and disposal Page 3 of 28 e access to or provision of services that ensure potential wastes are reduced, recycled or adequately treated before safe disposal, such as pre-treatment of process fluids, then discharge to sewerage scheme f site drainage controls to isolate potentially contaminated areas from discharge to the environment g environmental management and monitoring systems h environmental training and awareness programs for site employees and contractors i effective emergency response systems and land rehabilitation plans. 5 The location of industrial precincts and their waste treatment/disposal is likely to be of interest to the surrounding community. The proponent should adequately inform neighbours on the nature of the proposal and the safeguards to be included, then seek community feedback and respond effectively to specific issues raised relating to the local environment, community health and social concerns. Within public drinking water source areas (PDWSA) 6 These areas are declared under the Metropolitan Water Supply, Sewerage and Drainage Act 1909 or the Country Areas Water Supply Act 1947. They provide for the management and protection of catchments used as public drinking water sources. These areas are highly vulnerable to contamination. PDWSA include underground water pollution control areas (for groundwater catchment protection), water reserves and catchment areas. Source protection by-laws require that written approval be obtained from this department for most land development. Protection areas and zones are defined in source protection plans or land-use and water management strategies, which each undergo public consultation processes. 7 Within designated P1, P2 and P3 areas (see Appendix A – Public drinking water source areas), wellhead protection zones and reservoir protection zones, this department may oppose wastewater infrastructure and wastewater disposal if incompatible with our risk avoidance and risk minimisation objectives (see Reference 6b, WQPN 25,). Industry may occasionally receive approval, with conditions, where the proponent demonstrates that the development will either lower the risks posed by the present land-use activity, is vital to the state’s interests and that best environmental design, construction and operational practice are used. 8 Where conditional approval for an industrial site is
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